The Motion cars are fairly well documented in the east coast magazines such as Hi Performance Cars and Speed & SuperCar. Do you have a Motion Phase III GT with the fast back flat glass rear window or a Phase III Corvette with the stock body? Some of the cars had the stripe like the white & black ZL1 and others had a wider stripe around the tail section. here is a link to a magazine cover
http://albums.photopoint.com/j/View?...132&p=28397669